Improvement in t-squares



A. BRQNSON.

T Square. i N0.V58;o56. Patented sept. 18, 1866.

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UNITED STATES PATENT a AUSTIN BRONSON, OF NEYV YORK, N. Y.

IMPROVEMENT IN TFSQUARES.

Specification forming part of Letters Patent No. 58,056, dated September 18, 1866.

To all whom it may concern:

Be it known that I, AUSTIN BitoNsoN, of the city, county, and State of New York, have invented certain new and useful Improvements in Drawing-Squares; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in whicli Figure l is a `plan View of a T-square constructed according to inyiiivention. Fig.2 is a longitudinal section at right an gies to Fig. 1.

Similar letters of reference indicate corresponding parts iii both figures.

This invention relates to the application of a reversible bevel-stock to a T-square, such as is employed in architectural, mechanical, and other drawing, and for other purposes to which such instruments are applicable.

`The invention consists in a novel mode of combining the reversible bevel-stock to the T-square, whereby a right or left hand line can be drawn without interfering with the stock of the square itself, the said stock of the square being made to project upon one side only ot' the thickness of the blade, while the bevel-stock is situated upon or projects beyond both sides of the said blade and stock, thus enabling the operator to draw oblique lines in opposite directions by simply using one or the other sides ot' the square uppermost and using the bevel-stock as a guide upon the edge` of the drawing-board.

The invention further consists in a novel arrangement of a tangent scew or worm, a sliding frame supporting' the same, and an adjustingscrew with reference to each other and to the square and bevel stock and graduated sector attached thereto iii such a way that, while the bevelvstock may be moved or turned to any desired position, it may be graduated to any required angle with much more exactiiess than has hitherto been attained.

To enable others to understand the nature and construction of my invention, I will proceed to describe it with reference to the drawings. f

A is the blade of the square, which may be made of thin Inet-al or of wood, with straight and parallel edges, and of equal thickness throughout its length.

B is the stock of the square, to which is secured the blade A at right angles thereto and near one end of the said blade, the end of the blade extending beyond the square'stock B, and bein g irmly fastened to the central part of a graduated sector, C, the ends of which are secured to the ends of the square-stock, as clearly shown in Fig. l.

D is the adjustable bevelstock, which is furnished with a longitudinal slot extending from one edge to the other, through which works the end of the blade A, together with the stock B and graduated sector O, the inner end of the said stock being clasped upon and secured to the blade A and square-stock B by a thumb-screw, E. By this means the two sides of the bevel-stock project beyond the opposite sides of the square and its attached sector O, and may be turned upon its pivot, the tliunib-screw E, to any desired angle with regard to the blade A.

A hole, I), is formed in the bevel-stock upon the graduated side of the sector C, through which the graduating figures of the sector may be seen 5 and projecting inward from the edge of this hole is a pointer, a, by which the operator is ena-bled to set the bevel-stock at any desired number of degrees.

In order to secure a more delicate and exact adjustment of the bevel-stock than can be obtained by simply tightening the tliumb-screw E, as just described, and t0 afford an additional security against the accidental slipping of the bevel-stock, a tangent-screw, c, is so placed within a suitable recess or cavity in the outer endof the bevel-stock as to act upon a toothed rack formed upon the periphery ofthe sector O, as at d, the said tan gent-screw being moved to and from the periphery of the sector by means of a small adjusting-screw, j', which slides the sliding frame g, in which the tangentscrew c is pivoted, and which turns in a cross piece or bearing, 71 and is provided with shoulders upon each side ofthe said bearing, which prevents any longitudinal movement of the screw, a small milled head, i?, being secured upon the shaft of the tangent-screw in order to enable it to be easily turned. A similar milled head, j, is formed upon tlie head of the screw f for a like purpose, the opposite edges of Y the said milled heads projecting a ToE.

little beyond the sides of the bevel-stock through suitable holes or slots, so as to be easily turned by the fingers when required.

To operate and use the instrument as thus constructed, the tangent-screw o is first brought away from the periphery of the sector C by turning the adjusting-screwf by means of its milled head j. The thumb-screw E is then loosened, and the bevel-stock l) is turned upon the said screw until the pointer a is brought to the required degree marked upon the sector, Where it is confined by again tightening1 the thumbscrevv E. In case this adjustment is not sufficiently exact, the screw fis turned in an opposite direction, so as to bring the tangent-screw e in contact with the toothed rack upon the peripheryT of the sector C.

This being done, the tangent-screw is turned' by its milled head in one direction or the other, according` to the direction in which it is desired to move the bevelstock. The said screw, acting upon the periphery ot' the sector C, slowly moves the outer end of the bevelstock around the sector until the desired point is reached, when the bevel may be secured by turning the screw j" to press the tangent firmly against the teeth ot' the sector C.

rlhe instrumentis used by applying it to th at side of the drawingboard with which the given angle is required, one side of the bevelstock acting as a guide upon the edge of the board. If a reverse angle is desired, it is obtained by simply turning the instrument over and making the opposite side of the bevelstock the guide upon the board. A rectangle can be obtained at any time by using the square in the usual manner, as the position of the bevelstock does not interfere in any way With thestock B ofthe square.

What I claim as new, and desire to secure by Letters Patent, is-

l. The bevel-stock D, so constructed and applied to the T-square that its sides will project beyond each side of the said square, and thus enable the instrument to be employed for making right or left hand angular lilies without interfering with the head B of the square, substantially as herein set forth.

2. The tan gent-screw c, sliding frame g, and :nljnsting-screw j", arranged with reference to eachother and with the square A B, bevelstock D, and sector G substantially as herein set forth, for the purpose specified.

AUSTIN BRONSON.

NVitnesses: i

J. W. CooMBs, A. LECLERC. 

